However, even if the rats or mice die inside there is little likelihood of a bad smell. Bad smells are only a problem if the rodent dies somewhere very warm and un-ventilated. In 99% of cases there is not a problem. In order to prevent bad smells it is more important to deal with the infestation as the pests will be dying of natural causes and there is a higher chance of a bad smell. Rodenticide baits are the most efficient and effective way to deal with rat and mouse infestations.
I suggest to worried enquirers that they use traps in conjunction with rodenticides. When a rat or mouse has taken some poison it is more likely to be caught in a trap and then the body can be removed and the risk of bad odours reduced.
Once the infestation is eradicated then I suggest paying attention to proofing the house to prevent further infestation. You can get more information on how to prevent rats and mice getting in on the Kiwicare website.
A drunk walks into a bar with a rat and a frog. The drunk asks the barman if he can have a free drink if he shows him something amazing. "OK" says the barman, "But it must be truly amazing."
The drunk puts the frog on the bar piano and the frog begins to play the most amazing jazz.
"Wow!" says the barman. "That WAS truly amazing. Have a drink on me."
On finishing his drink the drunk asks "Can I have another drink if I show you something even more amazing?"
"OK." Says the barman. "If it is better than before, you can drink all night."
The drunk then sets the rat on the bar. The frog starts playing the piano and the rat sings along."
"Drinks all night for you." says the barman impressed.
An agent who has watched all this comes up to the drunk and says "I pay $1,000,000 for the frog and the rat."
"No deal" says the drunk.
"OK. What about $1,000 for the singing rat?"
"Done!" says the drunk.
"Are you mad?" says the barman to the drunk when the deal is done and the agent has left.
"Relax" says the drunk. "The frog is a ventriloquist."